We will define input/output as a subsystem of components that moves coded data between external devices and a host system, consisting of a CPU and main memory. I/O subsystems include but are not limited to:

  • Blocks of main memory that are devoted to I/O functions

  • Buses that provide the means of moving data into and out of the system

  • Control modules in the host and in peripheral devices

  • Interfaces to external components such as keyboards and disks

  • Cabling or communications links between the host system and its peripherals

Figure 7.1 shows how all of these components can fit together to form an integrated I/O subsystem. The I/O modules take care of moving data between main memory and a particular device interface. Interfaces ...

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